Improvement in coffee-mills



n. L. W'ZE-B B. Coffee-Mil i.

vPatented .Sept. 28-, 1 875 I 'NJhERS, PHDTO LITHOGRAPMER, WASHINGTON. D O.

PATENT orrron 1 'RQDOlrPHUS-L. WEBB, on'finnw nitirnrn, CONNECTICUT, AssIeNon TO LAnDERs, FRARY & CLARKE, on SAME PLACE.

IMPROVEMENT IN COFFEE-MILLS.

" Specification forming part of Letters Patent No. 168,307, dated September 28, 1875; application filed July 6, 1875. v

tion on line am,- Fig. 3, vertical section Figs.

4, 5, 6, detached views.

a This invention relates to an improvement in that class of mills for grinding coffee and similar purposes commonly called box-millsthat is to say, a vertical mill with a receptacle beneath to receive the ground material after h it has passed through the grinding process,

the object of the invention being to simplify and cheapenthe construction, and yet produce a durable mill; and the invention consists in the details of construction, as fully hereinafter specified. p

A is the base or box, which is made of substantially circular form and cast complete, as seen in Fig. 3, up to the cover B. The box is constructed with two headed lugs, a, projecting upward from its edge." The cover B is made practically a part of the hopper G. This cover is constructed with segmental slots b, corresponding to the lugs a, and enlarged at one end so as to pass on over the heads of the lugs a, and so that when'set onto the lugs a partial !turn, as denoted in Fig. 2, will secure the hop- Lper to the box,from which it may be removed by returning. the cover until the enlarged parts d of the slots come to the lugs, in which con- "dition the cov y be taken D is the runner, attached to a vertical shaft, E, and

supported onasaddle, F, in the hopper, in the usual manner, and to this shaft the crank G is attached to rotate the runner. H is the stationary runner-cylinder, which is constructed internally of the usual form, to correspond to the runner, and so that as the runner,which is of conical shape, is drawn up into the cylinder, the grinding will be finer, or, if lowered, the grinding will be coarser, substantially as in common construction of mills. The hopper G is -.-1

constructed with studs 6, which pass through corresponding perforations in the cover, and there riveted, so as to firmly secure the cover and hopper together, as seen in Fig. 3. Between the hopper and the cover an annular recess, f, is formed, into which a flange, h, on the runner-cylinder sets, and is placed there before the hopper and cover are secured together, so that the runner-cylinder is held in place by the same means which secures the'hopper and cover together, and, in order to prevent the turning of the cylinder with the runner, the

flange is constructed with notches n corresponding to the studs eor to other projections in the annular recess, which interlock with said studs or projections, and the cylinder is thereby held as a permanent part of the hopper. To adjust the runner vertically relative to its cylinder, to regulate the degree of fineness of the grinding, a sleeve, L, is placed over the shaft beneath the crank G, the lower edge of which is constructed with several notches, 1 2 3, more or less, the notches being of different depths, and on the saddle is formed a projection, 1, (see Fig. 6,) corresponding in width to the said notches, so that if the sleeve be turned to bring the notch 1 onto the projection Z, the sleeve will be held in that position and prevented from turning with the crank. The head of the crank rests upon the grinding produced. Intermediate notches will produce intermediate results.

I olaiin V l 1. A box-mill case, consisting of the box A, thecover B, and the hopper C, the box constructed with the headed lugs 11, and the cover with corresponding slots, whereby the two parts are secured. together, substantially as set forth.

2. The combir rim; of the cover 18 and hop runner-shaft, the notched sleeve L, and correperG, construct r with the in. r Fdiate respending projection l on the saddle, substancess f, with the ru nner-cylinder H, construct tially as and. for the purpose specified. ed with the flan ,'e h, andso as be interlock RODOLPHUS L. WEBB. between and with the said hopper and cover, Witnesses:

substantially as described. 7 4 O. S. LANDEBS, 3. In a vertical mill, the combi t m of the J O. ATWOOD. 

